Attackers behind February s fileless malware attacks dropped malware on some bank ATMs that gave them the ability to dispense money, at any time, at the touch of a button Kaspersky Lab said in February that attackers managed to hit 140 enterprises, including banks, telecoms, and government organizations, with the malware. The attackers were skilled at evading detection from the get-go; the malware that secured them access to the banks hid deep in the recesses of memory on affected servers.
Source: https://threatpost.com/fileless-banking-malware-attackers-break-in-cash-out-disappear/124711/